Scale used for radio apparatus or the like



Sept. 19, 1939. H. STRASSENBURG 2,173,503

SCALE USED FOR RADIO APPARATUS OR THE LIKE Filed Jan. 27. 19:58 I

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Patented Sept. 19, 1939 UNITED STATES PATENT QFFiCE SCALE USED FOR RADIO APPARATUS OR THE LIKE Application January 27, 1938, Serial No. 187,186 In Germany January 30, 1937 15 Claims.

.10 in station is illuminated by a strip of light caused to move over the entire width of the scale, or scales in which the names of the stations are divided into columns and the entire scale, including all station names, is lighted from the 15 rear, tuning in being performed by the adjustment :of an indicator to a graduation against the name of the desired station.

These arrangements have the disadvantage that the names of the stations require to be dis-.

20 posed in accordance with the calibrations, so that it is impossible to arrange the station names symmetrically or evenly, and-irregularities occur in the disposal of the names.

This disadvantage is avoided by the tuning 25 scale according to the invention, which is distinguished by its very convenient and lucid form, The invention will now be described more fully with reference to the accompanying drawing, in

which v 30 Fig. 1 is a rear diagrammatic view of the tuning scale,

Fig. 2 is a vertical sectional elevation on the line 2-2 of Fig. l."

Fig. 3 shows a partial rear view of the tuning 35 scale with the casing l0.

In the drawing, 8 is the scale plate bearing the names of the stations and the wavelength calibrations w. This plate is illuminated from the rear by one or more suitable light sources 40 provided on the slide s.

The essential feature 01 the arrangement consists in the casing Iii, which is mounted firmly behind the scale plate and is divided by lightscreening partitions 9 into single compartments 45 k1. 702, kg, etc. These compartments are arranged in accordance with the single lines of the station names. The casing I!) having the lightscreening partitions is also furnished in the rear wall with openings L, through which the light 50 from the slide s is enabled to enter the single compartments 101,702, 163, etc., and illuminate the particular station names from the rear. The openings L are stamped into the wall of the casing to agree with the wavelength cali- 65 brations, and upon actuation of the tuning knob I the slide s carrying the light source, guided by the rails and 6, is moved past the openings L by the-cord drive '2, 3, 4. In a certain position of the tuning knob l or tuning condenser A the slide 8 is located behind a certain opening L, 5 so that the name of the station corresponding to the particular tuning adjustment is caused to be illuminated.

The directional effect on the light produced by the openings L is such that merely one sta- 10 tion name, which if desired can also be furnished with a special marking, is illuminated. The next station name above or below is screened off by the partitions 9; and the station names to either side are so spaced that they cannot be reached 1 by'the cone of light produced by the opening L.

If. desired, the single horizontal compartments k1, kg, ha, etc., formed by the partitions 9 can also be divided by transverse partitions in the vertical direction in order essentially to preclude the least possibility of several station names located in the horizontal direction being illuminated simultaneously. These vertical partitions maybe seen from Fig. 3, wherein a partial rear I view of the casing Ill is schematically shown. I9 are the horizontal partitions and H are the vertical partitions. Generally speaking, however, the spacial disposal of the names horizontally and also the directional effect on the light will be such that even without the transverse partitions only one name will be illuminated at any given time.

Fig. 2 shows the scale 8 with the casing Ill, the single compartments 101, 702, Its, etc., the openings Land the slide 3.

Conveniently the slide s can be made, for example, cylindrical along the middle portion and can be furnished towards the scale with a narrow slot, through which the light is projected on to the openings in the wall of the casing it. It 40 can be furnished with a lining of reflecting material (which may be sprayed on), and if desired the slot can be covered with a light-transmitting material in order to obtain a diffuse light and accordingly an even illumination of the sta tion names. There can also be provided at the upper and lower ends of the slide s a prism 1 (Figs. 1 and 2), which permits of illuminated indication on the scale, not only of the station name, but also of the appertaining wavelength.

The light-screening partitions 9 within the casing ill will preferably be made of a good reflecting material, such as sheet metal having a bright surface; or also of a non-metallic material, such as cardboard or a pressed material, '55

ing coating, for example by a spraying process.

An essential advantage associated with the tuning scale according to the invention consists in the fact that the station names can be disposed for stations operating on medium waves, and the lower compartments are for long-wave stations. Provision can naturally also be made for the names of short-wave stations. The station names in the single wave ranges can accordingly be arranged in very convenient and lucid form.

It will be obvious that no limitation is made to the specific embodiment shown in the drawing, and that numerous modifications are quite possible within the meaning of the above description and the appended claims without departing from the spirit oi the invention. Thus, for example, the slide 3 carrying the light source can be arranged obliquely, andthe openings L can then be disposed vertically one below the other. The effect is the same. The station names then naturally also require to be disposed vertically on the scale.

What I claim as new and desire to secure by Letters Patent is:

'1. In a tuning scale for radio apparatus, a scale plate bearing the station names, a casing disposed behind the said plate, partitions within the said casing forming compartments corresponding to the said station names, a slide arranged behind the said scale plate and adapted to be moved along the said plate by the tuning-in means of the apparatus, arear wall to the said casing having openings therein corresponding to the wavelength calibrations in respect of the Single stations, and a' light source on the said slide adapted to project light through the said openings to illuminate the name'of the station which has been tuned in.

2. In a tuning scale for radio apparatus, a scale plate bearing the station names and wavelength calibrations, a casing disposed behind the said plate, partitions within the said casing forming compartments corresponding to the said station names, a slide behind the said scale plate and .adapted to be moved along the said plate by the tuning-in means of the apparatus, a light source on the said slide, a rear wall to the said casing having openings therein corresponding to the wavelength calibrations permitting the light from the said light source to illuminate only the name of the tuned-in station, and light-transmitting means on the said slide to illuminate the wavelength calibration of the tuned-in station.

3. In a tuning scale for radio apparatus a scale plate bearing the station names, a casing arranged behind said scale plate and being open towards said scale plate and containing horizontal partitions withinsaid casing forming compartments in accordance with the station names on the scale plate in horizontal direction and having openings in its wall and movable means for illuminating said scale plate from the back of saidcasing through said openings in accordance with the tuning means.

4. In a tuning scale for radio apparatus, a scale plate bearing the station names, a casing which if desired can be furnished with a reflect-- disposed behind the said plate, partitions within the 'said casing forming compartments corresponding to the said station names, a slide arranged behind the said scale plate and adapted to be moved along the said plate by the tuning-in means of the apparatus, a rear wall to the said casing having openings therein corresponding to the wavelength calibrations in respect of the single stations, and a light source on the said slide adapted to project light through thesaid openings to illuminate the name of the station. which has been tuned in, said slide being all round closed and only having an opening in the form of a narrow slot towards said casing so that the light is projected through said slot onto said rear wall of said casing.

5. In a tuning scale for radio apparatus, a scale plate bearing the station names, a casing disposed behind the said plate, partitions within the said casing forming compartments corresponding to the said station names, a slide arranged behind the said scale plate and adapted to be moved along the said plate by the tuningin means of the apparatus, a rear wall to the said casing having openings therein, corresponding to the wavelength calibrations in respect of the single stations, and a light source on the said slide adapted to project light through the said openings to illuminate the name of the station which has been tuned in, said slide being all round closed and only having an opening in the form of a narrow slot towards said casing and within said slot a light transmitting material in order to project diffuse light from said slide onto the rear wall of said casing.

6. In a tuning scale for radio apparatus a scale plate bearing the station names, light-screening partitions within a casing arranged behind said plate and having openings in its rear wall, and movable means for illuminating said scale plate from the back of said casing through said openings in accordance with the tuning means.

'7. In a tuning scale for radio apparatus a scale 'plate bearing the station names, a casing arranged behind said scale plate and being open towards said scale plate and containing horizontal partitions and transverse partitions in the vertical direction within said casing forming compartments in accordance with the station names on the scale'plate and having openings in its rear wall and movable means for illuminating said scale plate from the back of said casing through said openings in accordance with the tuning means.

8. In a tuning scale for radio apparatus a scale plate bearing the station names, light-screening partitions within a casing arranged behind said plate and having openings in its rear wall, and movable means for illuminating said scale plate from the back of said casing through said openings in accordance with the tuning means, said means comprising a slide arranged behind the said scale plate and adapted to be moved along the said plate by the tuning-in means of the apparatus, and a source on the said slide to illuminate the said scale plate from the rear.

9. In a tuning scale for radio apparatus a scale plate bearing the station names, light-screening partitions within a. casing arranged behind said plate and having openings in its rear wall, and movable means for illuminating said scale plate from the back of said casing through said openings in accordance with the tuning means, said means comprising a slide arranged behind the said scale plate and adapted to be moved along the said plate by the tuning-in means of the apparatus, and a source on the said slideto illuminate the said scale plate from the rear, said casing and said partitions being composed of a lightrefiecting material.

10. In a tuning scale for radio apparatus a scale plate bearing the station names, lightscreening partitions within a casing arranged behind said plate and having openings in its rear wall, and movable means for illuminating said scale plate from the back of said casing through said openings in accordance with the tuning means, said means comprising a slide arranged behind the said scale plate, and adapted to be moved along the said plate by the tuning-in means of the apparatus, and a source on the said 'slide to illuminate the said scale plate "from the rear, said casing and said partitions being composed of a sheet-metal having a bright sur-' face.

11. In a tuning scale for radio apparatus a scale plate bearing the station names, lightscreening partitions within a casing arranged behind said plate and having openings in its rear wall, and movable means for illuminating said scale plate from the back of said casing through said openings in accordance with the tuning means, said means comprising a slide arranged behind the'said scale plate and adapted to be moved along the said plate by the tuning-in means of the apparatus, and a source on the said slide to illuminate the said .scale plate from the rear, said casing and said partitions being composed of a nonmetallic material.

12. In a tuning scale for radio apparatus, a scale plate bearing the station names, lightscreening partitions within a casing arranged behind said plate and having openings in its rearwall, and movable means for illuminating said scale plate from the back of said casing through said openings in accordance with the tuning means, said means comprising a slide arranged behind the said scale plate and adapted to be moved along the said plate by the tuning-in means of the apparatus, and a source on the said slide to illuminate the said scale plate from the rear, said casing and said partitions being compo ed of a cardboard material.

13 In a tuning scale for radio apparatus a scale plate bearing the station names, lightscreening partitions within a casing arranged the rear, said casing and said partitions being composed of a, pressed artificial material. I

14. In a tuning scale for radio apparatus a "scale plate bearing the stationnames, lightscreening partitions within a casing arranged behind said plate and having openings in its rear wall, and movable means for illuminating said scale plate from the back of said casing through said openings in accordance with the tuning meanspsaid means comprising a slide arranged behind the said scale plate and adapted to be moved along the said plate by the tuning-in means of the apparatus, and. a source on the said slide to illuminate the said scale plate from the rear, said casing and said partitions being coated in their interior with a light-reflecting substance.

15. In a tuning scale for radio apparatus, a scale plate bearing the station names, a casing disposed behind the said plate, partitions within the said casing forming compartments corresponding to the said station names, a slide arranged behind the said scale plate and adapt- .ed to be moved along the said plate by the tuning-in means of the apparatus, a rear wall to the said casing having openings therein corresponding to the wavelength calibrations in respect of the single stations, and a light source on the said slide adapted to project light through the said openings to illuminate the name of the station which has been tuned in, .the said parti-.

tions being exchangeable.

HANS STRASSENBURG. 

